Method for treating copper-molybdenum mixed ores

A technology of mixing ore, copper and molybdenum, applied in the field of molybdenum metallurgy, can solve the problems of complex equipment structure, inconvenient transportation and storage, high melting point, and achieve the effects of simple material preparation process, good heat transfer effect and high heat utilization rate

Active Publication Date: 2013-11-06
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, pressure acid leaching has disadvantages such as molybdenum dispersed in two phases, difficult to recover, high requirements for reaction equipment, complex equipment structure, and high cost.
The problem of oxidative leaching of sodium hypochlorite is that the consumption of sodium hypochlorite is large, generally 1.5 to 2.0 times the theoretical amount, which makes the cost of oxidant too high; at the same time, some copper and iron will be mixed with MoO after entering the solution. 4 2- Insoluble molybdate precipitates are generated, causing greater loss of molybdenum; in addition, sodium hypochlorite is easy to decompose, which is not convenient for transportation and storage
However, molybdenite (MoS 2 ) has a melting point as high as 2375°C, and cannot be melted to form a molten pool like other heavy metal sulfides under the existing process conditions

Method used

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  • Method for treating copper-molybdenum mixed ores
  • Method for treating copper-molybdenum mixed ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] For the composition of Mo 3.00%, Cu 30.20%, S 41.10%, SiO 2 3.60%, CaO 2.40% copper, molybdenum mixed ore, option I is selected, 4.000kg copper, molybdenum mixed ore and 0.250kg quartz sand (containing SiO 2 97.00%), 0.660kg iron ore (with FeO 72.27%) mixed, then put it into the corundum crucible and heat it directly to 1200℃, keep it for 6h, and remove the smelting slag on the surface, totaling 0.840kg. Then pass air into the copper molybdenum matte (flow velocity is 2.5m 3 / h)100min. Obtained 1160kg of blister copper (containing Cu 98.50%, S 0.070%, Mo 0.006%), 0.160kg of soot (containing MoO 3 85.20%), 0.150kg of blowing slag (containing Cu 24.12%, Mo 44.23%), and the flue gas contains SO 2 14.5%.

Embodiment 2

[0043] For the composition of Mo 12.30%, Cu 25.20%, S 36.60%, CaO 1.60%, SiO 2 9.60% copper and molybdenum mixed ore, choose option I, mix 4.000kg copper and molybdenum mixed ore, 0.240kg limestone (containing CaO 45.10%), 0.780kg iron ore (containing FeO 72.27%), and then put into the corundum crucible Directly heat to 1400℃, keep for 10h, and remove the smelting slag on the surface, totaling 1210kg. Then pass oxygen-enriched air (40% oxygen, flow rate 1.5m) into the copper molybdenum matte 3 / h) 120min. Obtained 1.023kg of blister copper (containing 98.3% of Cu, 0.077% of S, 0.004% of Mo), 0.706kg of soot (containing MoO 3 97.50%), 0.144kg of blowing slag (containing Cu 30.06%, Mo 36.13%), SO in flue gas 2 10.2%.

Embodiment 3

[0045] For the composition of Mo 54.00%, Cu 1.50%, S 36.6%, CaO 2.00%, SiO 2 1.20% copper and molybdenum mixed ore, choose option II, mix 1.000kg copper and molybdenum mixed ore with 2.500kg copper matte (containing Cu 75.00%, S 19.40%, Fe 1.28%), and then put it in a corundum crucible for direct heating To 1300℃, keep for 4 hours. Then pass air into the copper molybdenum matte (flow velocity is 2.5m 3 / h) 60min. Obtained 2.100kg of low-molybdenum copper matte (containing Mo 1.63%, Cu 77.30%, S 17.20%), and obtained 0.763 kg of soot (containing MoO 3 98.30%), SO in flue gas 2 7.6%.

[0046] Mix the above-mentioned low-molybdenum copper matte with 0.400kg of copper matte (containing Cu 60.00%, S 29.10%, Fe 7.66%) and add 1.000kg of copper and molybdenum mixed ore (the composition is the same as the aforementioned copper and molybdenum mixed ore in this embodiment ), mix well and put it in a crucible, and heat it to 1300℃ for 4h. Then pass oxygen-enriched air (30% oxygen, flow...

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Abstract

The invention discloses a method for treating copper-molybdenum mixed ores, belonging to the field of molybdenum metallurgy. The method comprises the following steps: directly heating the copper-molybdenum mixed ores to a molten state, or heating to a molten by using an assistant flux copper matte (matte) (for high-molybdenum low-copper mixed concentrate) to form copper molybdenum matte; introducing air or oxygen-enriched air into the copper molybdenum matte to carry out converting until molybdenum sulfide in the copper molybdenum matte is oxidated into MoO3 to be volatilized, recycling the MoO3 from smoke dust by dust collection, and sending the dedusted flue gas to the acid making process; and after finishing converting, returning the low-molybdenum copper matte to the next matte formation process or sending the low-molybdenum copper matte to a copper smelting system. The method has the advantages of short process, favorable mass-transfer heat-transfer conditions, high productivity, high heat utilization, high SO2 concentration in flue gas, strong adaptability to raw materials, and the like.

Description

Technical field [0001] The invention belongs to the field of molybdenum metallurgy and relates to a method for extracting molybdenum from copper and molybdenum mixed ore. Background technique [0002] Molybdenum is a rare and high melting point metal, which is widely used in electrical and electronic, material processing, chemical, glass industry, high-temperature electric furnaces, aerospace and defense and military industries. The most important molybdenum mineral is molybdenite, which accounts for more than 90% of the world's molybdenum mining. In nature, molybdenite often coexists with other heavy metal sulfides such as galena and chalcopyrite to form polymetallic composite ore. [0003] According to reports, about 50% of the world’s current molybdenum production comes from copper-molybdenum ore, which is recycled as a by-product of copper concentrate. For example, more than 20 copper mines in Chile, North America and South America mainly recover molybdenum from the by-produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B15/00C22B34/34
CPCY02P10/20
Inventor 赵中伟李洪桂郝明明陈星宇
Owner CENT SOUTH UNIV
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